As a factual matter, i. e. "unexpected consequences", your idea might become true. But it's a risky strategy to hope that premature obsolescence of your product will result in consumers coming back for more. With the VW diesel scandal in the background, it's also possible that the industry will end up having to shoulder a major part of the monetary burdens. It's much more likely that the loss to their brands, and the very public failure of their diesel strategy, will far outweigh any gains from some turnover in cars.
Some diesel cars may also be retrofitted with cleaner technology, and others can probably be sold abroad, making the losses not quite as large as one might expect.
But I find suprising that over the last years it became obvious that electric cars are not the choice for the largest majority of any new car buyers. But all of the sudden the car manufacturer industry is having a scandal (aparently mostly in Germany) that becomes such a manficent scandal that is reaching a dimension never seen before. As a result a large number of cars is most likely going to be taken out of the market that would have never been replaced that early on.
Besides from kicking out a few employees, updating a few models and paying fines, the latter both probably covered by their insurances, the companies have no real consequences experienced. Sales and revenues seem to be stable and a few % changes in brand reputation are not going to hurt them either. Ultimately there will soon be a lot more cares purchased at a time where Tesla is still not mainstream ready.
Sometimes you have to kill the one to save the many.